JPH0531144B2 - - Google Patents
Info
- Publication number
- JPH0531144B2 JPH0531144B2 JP59219220A JP21922084A JPH0531144B2 JP H0531144 B2 JPH0531144 B2 JP H0531144B2 JP 59219220 A JP59219220 A JP 59219220A JP 21922084 A JP21922084 A JP 21922084A JP H0531144 B2 JPH0531144 B2 JP H0531144B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- photoreceptor
- peak wavelength
- light source
- potential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 108091008695 photoreceptors Proteins 0.000 claims description 48
- 230000003068 static effect Effects 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 7
- QLNFINLXAKOTJB-UHFFFAOYSA-N [As].[Se] Chemical compound [As].[Se] QLNFINLXAKOTJB-UHFFFAOYSA-N 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 11
- 230000008030 elimination Effects 0.000 description 9
- 238000003379 elimination reaction Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 3
- 229910052711 selenium Inorganic materials 0.000 description 3
- 239000011669 selenium Substances 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 230000006798 recombination Effects 0.000 description 2
- 238000005215 recombination Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010893 electron trap Methods 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Landscapes
- Control Or Security For Electrophotography (AREA)
Description
【発明の詳細な説明】
＜技術分野＞
この発明は連続使用した場合に感光体の光疲労
を起こすセレン等からなる電子写真感光体の帯電
電位安定化方法に関する。DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a method for stabilizing the charging potential of an electrophotographic photoreceptor made of selenium or the like which causes optical fatigue of the photoreceptor when used continuously.
＜従来技術とその欠点＞
セレン等からなる電子写真感光体は、連続使用
すると感光体が疲労して濃度低下、地カブリの増
大、ゴースト像の発生等種々の問題を発生する。
特にAs2Se3感光体のように非常に高感度な感光体
では、高速で連続使用した場合にこの問題が一層
深刻なものなる。またセレン系の感光体において
は一般に感光体の休止期間に応じて暗減衰率が変
化することが知られている。これは感光体の層中
にトラツプされていた電荷が休止時間とともに
徐々に開放されていくためである。従来からこの
ような光疲労を防止し、感光体の帯電電位を安定
化させる種々の方法が提案されてきた。例えば、
特公昭45−30818号ではAs―Se系感光板に対し
5400Å以上の波長の光をカツトした光源を照射
し、光疲労の発生を防止する方法が提案されてい
る。しかし、この方法では非常に高感度な感光体
であるAs2Se3感光板を高速で使用すると、光量を
いくら多くしても除電不足が生じて残留電位の上
昇が防止できず、地カブリの増大を防ぐことがで
きない。また特開昭53−148444号ではコピー動作
に先立つて予備回転を与え、この間に6200Åのピ
ーク波長の光を照射して感光体を疲労させた後コ
ピー動作に入る方法を提案しているが、この方法
では初期の帯電電位は安定化できるが、連続使用
時の残留電位上昇はこれだけでは完全に防止する
ことが不可能である。さらに特開昭58−114082号
では、光除電から次工程の一様帯電までの時間を
0.2sec以上に設定することにより、感光体を強制
的に疲労させなくても通常の光除電で安定した表
面電位が得られる方法を示しているが、感光体ド
ラムの小径化や複写機、プリンタの高速化の要求
に応えることができない不都合がある。さらにこ
れらの何れの方法であつても複写動作を終了して
感光体が暗中において休止状態に入ると、感光層
中にトラツプされていた電荷は徐々に開放される
ため、その後再び連続複写動作に入つたとき休止
期間の長さによつては初期に地カブリを起こすか
連続複写中にコピー濃度が低下するという問題が
あつた。<Prior Art and Its Disadvantages> When an electrophotographic photoreceptor made of selenium or the like is used continuously, the photoreceptor becomes fatigued, causing various problems such as a decrease in density, an increase in background fog, and the generation of ghost images.
In particular, with a highly sensitive photoreceptor such as the A s2 S e3 photoreceptor, this problem becomes even more serious when used continuously at high speeds. Furthermore, it is known that in a selenium-based photoreceptor, the dark decay rate generally changes depending on the rest period of the photoreceptor. This is because the charges trapped in the layers of the photoreceptor are gradually released with the rest time. Conventionally, various methods have been proposed for preventing such optical fatigue and stabilizing the charged potential of the photoreceptor. for example,
Special Publication No. 1981-30818 deals with A s - S e type photosensitive plates.
A method has been proposed to prevent the occurrence of optical fatigue by irradiating with a light source that cuts out light with a wavelength of 5400 Å or more. However, when using this method at high speed with the A s2 S e3 photosensitive plate, which is a highly sensitive photoreceptor, no matter how much light is used, static removal is insufficient and an increase in residual potential cannot be prevented, resulting in background fog. Unable to prevent growth. Furthermore, JP-A-53-148444 proposes a method in which a preliminary rotation is given prior to the copying operation, and during this period, light with a peak wavelength of 6200 Å is irradiated to fatigue the photoreceptor before starting the copying operation. Although this method can stabilize the initial charging potential, it is impossible to completely prevent an increase in residual potential during continuous use. Furthermore, in JP-A No. 58-114082, the time required from optical static elimination to uniform charging in the next process is
By setting the value to 0.2 seconds or more, a stable surface potential can be obtained through normal optical static elimination without forcing the photoreceptor to fatigue. The disadvantage is that it cannot meet the demand for higher speeds. Furthermore, in any of these methods, when the photoreceptor enters a resting state in the dark after the copying operation is completed, the charges trapped in the photosensitive layer are gradually released, so that the continuous copying operation is resumed. Depending on the length of the pause period, there is a problem that background fog may occur at the beginning or copy density may decrease during continuous copying.
＜発明の目的＞
この発明の目的は、特にAs2Se3感光体のような
高感度な感光体を用いたコピーサイクルにおい
て、短波長と長波長の除電光を照射することによ
り、高速で連続使用する際の帯電電位の安定化お
よび残留電位の上昇防止を実現するとともに、長
波長の光量をコピーサイクルの休止期間の長さに
従つて多くし、鮮明な濃度の画像を安定して供給
できる最も効果的で且つ実用的な帯電電位安定化
方法を提供することにある。<Objective of the Invention> The object of the present invention is to irradiate static elimination light of short wavelength and long wavelength in a copy cycle using a high-sensitivity photoreceptor such as an A s2 S e3 photoreceptor, in particular, to perform high-speed and continuous destaticization. In addition to stabilizing the charging potential during use and preventing increases in residual potential, the amount of long-wavelength light increases according to the length of the pause period in the copy cycle, making it possible to stably supply images with clear density. The object of the present invention is to provide the most effective and practical charging potential stabilization method.
＜発明の構成および効果＞
この発明は、砒素−セレン計の感光体を用い、
該感光体の除電を行う際に、6000Å以下のピーク
波長を有する光と、6200Å以上のピーク波長を有
する光とを同時または相前後して照射するものに
おいて、
複写動作の終了時から複写動作の開始時までの
感光体の休止期間を測定し、
その計測した期間が長くなるに従い、複写動作
開始による感光体の少なくとも最初の回転時に、
6200Å以上のピーク波長を有する光の光量が多く
なるように照射し、6000Å以下のピーク波長を有
する光については上記休止期間に関係なく通常の
設定された光量にて照射することを特徴とするも
のである。<Structure and effects of the invention> The present invention uses a photoreceptor of an arsenic-selenium meter,
When removing static electricity from the photoreceptor, light with a peak wavelength of 6,000 Å or less and light with a peak wavelength of 6,200 Å or more are irradiated at the same time or in succession, from the end of the copying operation to the end of the copying operation. The period of rest of the photoreceptor before the start is measured, and as the measured period becomes longer, at least during the first rotation of the photoreceptor due to the start of the copying operation,
Light having a peak wavelength of 6200 Å or more is irradiated in such a way that the amount of light is increased, and light having a peak wavelength of 6000 Å or less is irradiated at a normal set light amount regardless of the above-mentioned rest period. It is.
第２図は露光光源の種類を変えたときのコピー
サイクル数に対する表面電位の変化を示す図であ
る。今、除電光として6000Å以上のピーク波長を
有する光を使用したとすると、感光体ドラムが低
速で回転する場合、即ち複写速度の遅い場合には
同図Ａで示すように繰り返しコピーサイクルによ
つても安定した表面電位特性を得ることができ
る。この理由は除電後、次の再帯電までの時間が
感光体中でキヤリアの再結合に要する時間を十分
にカバーするからである。しかし、この6000Å以
下のピーク波長を有する光のみを使つて感光体ド
ラムの回転速度を高速にすると、除電から帯電に
至るまでの時間がキヤリアの再結合に必要な時間
をカバーすることができなくなるため、同図のＢ
に示すようにコピーサイクル数の増加に従つて残
留電位の上昇が見られるようになる。このような
現象は特に除電から帯電までに至る時間が0.2秒
以下の場合に著しく生じることが確認されてい
る。これに対して除電光として白色光やピーク波
長が6200Å以上にある光を単独に使用すると、第
２図Ｃに示すように残留電位の上昇はないが帯電
電位が徐々に低下していく。この原因はこのよう
な波長の光は感光体の内部まで深く進入するから
除電効果が大きい反面、感光層内部に多数の電子
トラツプを作つてしまうため、コピーサイクル数
の増加に従つて帯電電位を実質的に減少させよう
とするからである。 FIG. 2 is a diagram showing the change in surface potential with respect to the number of copy cycles when the type of exposure light source is changed. Now, if we use light with a peak wavelength of 6000 Å or more as the static eliminating light, when the photosensitive drum rotates at a low speed, that is, when the copying speed is slow, the static electricity removal light is caused by repeated copy cycles as shown in A in the same figure. It is also possible to obtain stable surface potential characteristics. The reason for this is that the time until the next recharging after neutralization sufficiently covers the time required for recombination of carriers in the photoreceptor. However, if only light with a peak wavelength of 6000 Å or less is used to increase the rotation speed of the photoreceptor drum, the time from static elimination to charging will not cover the time required for carrier recombination. Therefore, B in the same figure
As shown in Figure 3, as the number of copy cycles increases, the residual potential increases. It has been confirmed that such a phenomenon occurs particularly when the time from static elimination to charging is 0.2 seconds or less. On the other hand, when white light or light having a peak wavelength of 6200 Å or more is used alone as the static eliminating light, the residual potential does not increase as shown in FIG. 2C, but the charged potential gradually decreases. The reason for this is that although light with such wavelengths penetrates deep into the photoreceptor, it has a strong charge removal effect, but on the other hand, it also creates many electron traps inside the photoreceptor layer, so the charged potential decreases as the number of copy cycles increases. This is because they are trying to substantially reduce it.
一方、第２図Ａに示すような帯電電位、残留電
位の変化特性を得ることができても複写サイクル
を中止し、感光体を暗中にて休止させた後再び連
続複写を行うと、第３図に示すように初期におい
て帯電電位の変化が著しくなる。第４図は休止時
間の長さに対する帯電電位の変化度合を示す図で
ある。同図から概ね30分までの時間経過に対し帯
電電位の変化があることが分かる。 On the other hand, even if it is possible to obtain the change characteristics of the charging potential and residual potential as shown in FIG. As shown in the figure, the charging potential changes significantly in the initial stage. FIG. 4 is a diagram showing the degree of change in charging potential with respect to the length of rest time. It can be seen from the figure that there is a change in the charging potential over time up to approximately 30 minutes.
以上の特性を前提に置きながら、本発明者らは
6000Å以下のピーク波長を有する光と6200Å以上
のピーク波長を有する光を感光体の休止期間の長
さを変えながら同時または相前後して照射する実
験を行つた。その結果、両方の光源を使用するこ
とによりコピーサイクル数の増大に対する帯電電
位、残留電位の変化は少なくなり、特にそれらの
光源の光量の組み合わせに最適値があることを見
出した。さらに感光体の休止期間後に再複写を行
うときには少なくとも最初の回転にて6200Å以上
のピーク波長を有する光をその光量が感光体の休
止期間の長さが長くなるに従つて多くなるように
設定して照射することにより、休止期間に無関係
に帯電電位が常に安定化できることを見出した。
感光体の除電を行うのに照射する両方の光量の組
み合わせは、種々検討した結果、6000Å以下のピ
ーク波長を有する光の光量を感光体電荷量を半分
にする半減露光量の５倍〜50倍、好ましくは10倍
〜20倍に設定し、6200Å以上のピーク波長を有す
る光の光量を上記半減露光量の0.1倍〜10倍、好
ましくは0.5倍〜２倍に設定するのが最も良い結
果をもたらした。即ち、連続複写中において各光
源の光量をこの範囲に設定することで感光体ドラ
ムが高速回転で使用されても第１図のＡで示され
るように安定した表面電位特性を得ることができ
た。尚、ここで言う半減露光量とは感光体上の電
荷量を半分にするのに必要な光のエネルギーのこ
とを言う。また上記の範囲の中から最適な光量を
設定するにはドラム径やドラム周速、さらに両光
源の発光スペクトル等を考慮して決定することに
なる。また、感光体の休止期間後に再複写を行う
場合の最初の回転では、それまでの休止期間の長
さが長くなるに従つて6200Å以上のピーク波長を
有する光の光量を多くし、その範囲を上記半減露
光量の１倍〜50倍に設定すると良い結果を得るこ
とができた。 Based on the above characteristics, the present inventors
An experiment was conducted in which light with a peak wavelength of 6000 Å or less and light with a peak wavelength of 6200 Å or more were irradiated simultaneously or one after another while changing the length of the rest period of the photoreceptor. As a result, it has been found that by using both light sources, changes in charging potential and residual potential with respect to increase in the number of copy cycles are reduced, and in particular, there is an optimum value in the combination of the light amounts of these light sources. Furthermore, when copying is performed again after the photoreceptor rest period, at least in the first rotation, the amount of light is set to increase as the length of the photoreceptor rest period becomes longer. It has been found that by irradiating the battery with irradiation, the charged potential can be constantly stabilized regardless of the rest period.
As a result of various studies, the combination of both amounts of light to be irradiated to remove static electricity from the photoreceptor was determined to be 5 to 50 times the amount of light with a peak wavelength of 6000 Å or less than the halving exposure amount that halves the amount of charge on the photoreceptor. , preferably 10 to 20 times, and setting the amount of light having a peak wavelength of 6200 Å or more to 0.1 to 10 times, preferably 0.5 to 2 times, the half-exposure amount above for best results. Brought. That is, by setting the light intensity of each light source within this range during continuous copying, it was possible to obtain stable surface potential characteristics as shown by A in Figure 1 even when the photoreceptor drum was used at high speed rotation. . It should be noted that the term "half exposure amount" as used herein refers to the energy of light required to halve the amount of charge on the photoreceptor. Further, in order to set the optimum light amount within the above range, the drum diameter, drum circumferential speed, and emission spectra of both light sources must be taken into consideration. In addition, in the first rotation when copying is performed again after the photoreceptor rest period, the amount of light with a peak wavelength of 6200 Å or more is increased as the length of the rest period becomes longer, and the range is expanded. Good results were obtained by setting the exposure amount to 1 to 50 times the half-reduced exposure amount.
この発明による感光体の帯電電位安定化方法に
よれば、砒素−セレン系の高感度の感光体を高速
で連続使用しても、除電を効率よく行うことがで
き、帯電電位の安定化及び残留電位の上昇を防止
でき、高速複写を行つても安定した濃度の画像を
得ることができる。 According to the method for stabilizing the charged potential of a photoreceptor according to the present invention, even if a high-sensitivity arsenic-selenium photoreceptor is used continuously at high speed, it is possible to efficiently remove static electricity, stabilize the charged potential, and eliminate residual charges. It is possible to prevent an increase in potential and obtain images with stable density even during high-speed copying.
また、感光体の休止期間後に、再度複写開始を
行う際には、感光体の最初の回転時に6200Å以下
のピーク波長を有する光の光量のみ、感光体の休
止期間の長さが長くなるに従つて多くなるように
設定し照射するため、休止期間の長短にかかわら
ず、常に安定した表面電位を保つまでの期間を短
縮し、よつてその後の帯電―露光による画像形成
を開始する時間の短縮により、高速複写を損なう
ことはない。 In addition, when copying is started again after the photoconductor rest period, only the amount of light having a peak wavelength of 6200 Å or less during the first rotation of the photoconductor increases as the photoconductor rest period becomes longer. Since the irradiation is set so that the surface potential increases, the period of time required to maintain a stable surface potential regardless of the length of the pause period is shortened, and the time required to start image formation by charging and exposure is shortened. , without compromising high-speed copying.
＜実施例＞
第１図はこの発明に係る帯電電位安定化方法を
実施する電子写真複写機の概略構造図である。感
光体ドラム１としては感光層の厚みが60μｍに設
定されているAs2Se3感光体ドラムが使用される。
直径はΦ60〜Φ140mm程度に設定され、矢印方向
に回転する。この感光体ドラム１の周囲には感光
体ドラム表面を700V〜1000Vに一様に帯電させ
る帯電器２、現像器４、転写帯電器５、感光体の
除電をするための第１の光源８、クリーニング部
６、感光体の除電を行うための第２の光源７がそ
れぞれこの順番に配置されている。前記第１の光
源８としては6200Å以上のピーク波長を有するも
のが使用される。第２の光源７としては6000Å以
下のピーク波長を有する光源が使用される。光源
７としては螢光灯を使用するが、他にEL、LED
等を使用することができ、さらにフイルタと組み
合わせることもできる。光源８としてはLEDを
使用する。第５図Ａは光源８の相対発光強度特性
を示す。この例では7000Åのピーク波長を有して
いる。第５図Ｂは光源７の相対発光強度特性を示
す。この例では5030Åのピーク波長を有してい
る。第５図Ｃは光源７に使用することのできる他
の例を示している。第６図は光源８の制御部のブ
ロツク図である。CPU１０はコピー始動信号お
よびコピー終了信号をメモリ１１に送り、メモリ
１１ではこの信号が送られてきた時間を記憶す
る。休止時間演算回路１２は上記メモリ１１に記
憶されているコピー始動信号の送られてきた時間
とコピー終了信号の送られてた時間から感光体の
休止時間を演算する。さらにその演算結果に従つ
て出力切り換え回路１３に切り換え信号を送る。
出力切り換え回路１３は休止時間演算回路１２か
らの切り換え信号に応じて抵抗Ｒ１〜Rnを切り
換え電源１４で駆動される光源８の駆動電流を決
定する。休止時間演算回路１２は休止時間が長い
程光源８を駆動する電流が大きくなるように出力
切り換え回路１３を制御する。このため、休止時
間が長くなればなる程光源８の光量は増えること
になる。尚、休止時間演算回路１２は休止時間に
応じて光源８の駆動電流を可変する制御を休止期
間後のコピーサイクルの最初の感光体回転におい
てのみ行い、二回転目以降は予め設定されている
特定の駆動電流に設定している。この場合、最初
の感光体の回転時に、複写の休止期間が長くなる
に従つて、長い波長側の光源８による光量を多く
して感光体を照射しているので、この光照射を繰
り返し行うことなく、感光体の安定状態時と同様
に感光層内にトラツプされるキヤリアの量をほぼ
一定にでき、これにより複写動作に入るまでの前
処理にて感光体を回転させて除電する時間を短縮
し、効率的な除電を行える。<Example> FIG. 1 is a schematic structural diagram of an electrophotographic copying machine that implements the charging potential stabilization method according to the present invention. As the photosensitive drum 1, an A s2 S e3 photosensitive drum whose photosensitive layer thickness is set to 60 μm is used.
The diameter is set to about Φ60 to Φ140mm, and it rotates in the direction of the arrow. Around the photoreceptor drum 1, there is a charger 2 for uniformly charging the surface of the photoreceptor drum to 700V to 1000V, a developing device 4, a transfer charger 5, a first light source 8 for eliminating static electricity from the photoreceptor. A cleaning section 6 and a second light source 7 for removing static from the photoreceptor are arranged in this order. As the first light source 8, one having a peak wavelength of 6200 Å or more is used. As the second light source 7, a light source having a peak wavelength of 6000 Å or less is used. A fluorescent lamp is used as the light source 7, but EL and LED are also used.
etc., and can also be combined with filters. As the light source 8, an LED is used. FIG. 5A shows the relative emission intensity characteristics of the light source 8. This example has a peak wavelength of 7000 Å. FIG. 5B shows the relative emission intensity characteristics of the light source 7. This example has a peak wavelength of 5030 Å. FIG. 5C shows another example that can be used for the light source 7. FIG. 6 is a block diagram of the control section of the light source 8. The CPU 10 sends a copy start signal and a copy end signal to the memory 11, and the memory 11 stores the time when these signals were sent. The rest time calculation circuit 12 calculates the rest time of the photoreceptor from the time when the copy start signal was sent and the time when the copy end signal was sent, which are stored in the memory 11. Furthermore, a switching signal is sent to the output switching circuit 13 according to the calculation result.
The output switching circuit 13 switches the resistors R1 to Rn in response to a switching signal from the pause time calculation circuit 12 and determines the drive current of the light source 8 driven by the power source 14. The pause time calculation circuit 12 controls the output switching circuit 13 so that the longer the pause time is, the larger the current for driving the light source 8 becomes. Therefore, the longer the pause time, the more the light amount from the light source 8 increases. Note that the pause time calculation circuit 12 performs control to vary the driving current of the light source 8 according to the pause time only in the first rotation of the photoconductor in the copy cycle after the pause period, and from the second rotation onward, the drive current of the light source 8 is controlled to vary according to the pause time, and from the second rotation onwards, the driving current of the light source 8 is varied according to the pause time. The drive current is set to . In this case, when the photoreceptor rotates for the first time, as the copying pause period becomes longer, the amount of light from the light source 8 on the long wavelength side increases and irradiates the photoreceptor, so this light irradiation must be repeated. This makes it possible to keep the amount of carriers trapped in the photosensitive layer almost constant, just as when the photoconductor is in a stable state, which reduces the time required to rotate the photoconductor and remove static electricity during pre-processing before starting the copying operation. This enables efficient static elimination.
第７図は感光体の休止後、プリントスイツチが
押下されて感光体ドラムが回転し始めるときのタ
イミングチヤートを示している。図示するように
最初の回転では光源８の光量をＨ１に設定し、次
の回転以降はＨ２に設定している。第８図は以上
の制御を行つたときの表面電位の変化特性図であ
る。図示するように、休止時間が途中にあつても
暗部電位、残留電位の変化は殆どないことが分か
る。尚、光源８は第１図に示す１〜５の何れかの
位置に設定することによつても同様の効果を得る
ことが確認できた。さらに光源７，８は連続複写
中において同時に照射してもまた相前後して照射
するようにしても同様の効果を得ることが確認で
きた。 FIG. 7 shows a timing chart when the print switch is pressed and the photoreceptor drum starts rotating after the photoreceptor has stopped operating. As shown in the figure, the light intensity of the light source 8 is set to H1 during the first rotation, and set to H2 from the next rotation onwards. FIG. 8 is a characteristic diagram of changes in surface potential when the above control is performed. As shown in the figure, it can be seen that there is almost no change in the dark potential and the residual potential even if the pause time is in the middle. It has been confirmed that the same effect can be obtained by setting the light source 8 at any of the positions 1 to 5 shown in FIG. Furthermore, it was confirmed that the same effect could be obtained even if the light sources 7 and 8 were used to irradiate simultaneously or sequentially during continuous copying.
第１図はこの発明が実施される電子写真複写機
の概略構造図、第２図は除電のための露光光源の
種類を変えた時のコピーサイクル数に対する表面
電位の変化を示す図である。第３図はこの発明が
実施されない場合のコピーサイクル数に対する表
面電位の変化特性図、第４図は休止時間の長さに
対する表面電位の変化度合を示す図である。第５
図Ａ〜Ｃは除電光として使用する光源の相対発光
強度特性を示す図である。さらに第６図は光源８
の制御部のブロツク図、第７図はプリントスイツ
チ押下時のタイミングチヤート、第８図は本発明
を実施した場合のコピーサイクル数に対する表面
電位の変化特性を示す図である。
７，８……除電光として使用する光源。
FIG. 1 is a schematic structural diagram of an electrophotographic copying machine in which the present invention is implemented, and FIG. 2 is a diagram showing changes in surface potential with respect to the number of copy cycles when the type of exposure light source for static elimination is changed. FIG. 3 is a characteristic diagram of changes in surface potential with respect to the number of copy cycles when the present invention is not implemented, and FIG. 4 is a diagram showing the degree of change in surface potential with respect to the length of rest time. Fifth
Figures A to C are diagrams showing relative emission intensity characteristics of light sources used as static elimination light. Furthermore, Figure 6 shows the light source 8.
FIG. 7 is a timing chart when the print switch is pressed, and FIG. 8 is a diagram showing the change characteristics of the surface potential with respect to the number of copy cycles when the present invention is implemented. 7, 8...Light source used as static elimination light.
Claims (1)
のピーク波長を有する光と、6200Å以上のピーク
波長を有する光とを同時または相前後して照射し
除電を行うものにおいて、 複写動作の終了時より複写動作の開始までの感
光体の休止期間を測定する第１のステツプと、 上記回転する少なくとも最初の回転における感
光体に対し、上記6200Å以上のピーク波長を有す
る光は、その光量が上記感光体の休止期間が長く
なるに従つて多くなるように設定して照射し、上
記6000Å以下のピーク波長を有する光は上記休止
期間に関係なく予め設定された特定の光量にて照
射する第３ステツプと、 からなる電子写真感光体の帯電電位安定化方法。[Claims] 1. In a method that uses an arsenic-selenium photoreceptor and irradiates it with light having a peak wavelength of 6000 Å or less and light having a peak wavelength of 6200 Å or more simultaneously or one after another to eliminate static electricity. a first step of measuring the rest period of the photoreceptor from the end of the copying operation to the start of the copying operation; , the amount of light is set to increase as the rest period of the photoreceptor becomes longer, and the light having a peak wavelength of 6000 Å or less is irradiated at a preset specific light amount regardless of the rest period. A third step of irradiating the electrophotographic photoreceptor with the electrophotographic photoreceptor.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59219220A JPS6197667A (en) | 1984-10-17 | 1984-10-17 | Method for stabilizing charged potential of electrophotographic sensitive body |
| DE19853536836 DE3536836A1 (en) | 1984-10-17 | 1985-10-16 | UNLOADING DEVICE FOR A COPIER |
| US06/788,738 US4827306A (en) | 1984-10-17 | 1985-10-17 | Discharging apparatus and method for use in a copying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59219220A JPS6197667A (en) | 1984-10-17 | 1984-10-17 | Method for stabilizing charged potential of electrophotographic sensitive body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6197667A JPS6197667A (en) | 1986-05-16 |
| JPH0531144B2 true JPH0531144B2 (en) | 1993-05-11 |
Family
ID=16732081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59219220A Granted JPS6197667A (en) | 1984-10-17 | 1984-10-17 | Method for stabilizing charged potential of electrophotographic sensitive body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6197667A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0258069A (en) * | 1988-08-24 | 1990-02-27 | Ricoh Co Ltd | Controlling method for copying of copying machine |
| US5606398A (en) * | 1995-04-28 | 1997-02-25 | Minnesota Mining And Manufacturing Company | Reduction of residual potential and ghosting in a photoconductor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS547347A (en) * | 1977-06-14 | 1979-01-20 | Siemens Ag | Electronic copy apparatus |
| JPS57148782A (en) * | 1981-03-10 | 1982-09-14 | Fuji Xerox Co Ltd | Light quantity controlling method for prefatigue lamp of copying machine |
-
1984
- 1984-10-17 JP JP59219220A patent/JPS6197667A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS547347A (en) * | 1977-06-14 | 1979-01-20 | Siemens Ag | Electronic copy apparatus |
| JPS57148782A (en) * | 1981-03-10 | 1982-09-14 | Fuji Xerox Co Ltd | Light quantity controlling method for prefatigue lamp of copying machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6197667A (en) | 1986-05-16 |
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